419 строки
10 KiB
C
419 строки
10 KiB
C
/*
|
|
* Driver for the Cirrus EP93xx matrix keypad controller.
|
|
*
|
|
* Copyright (c) 2008 H Hartley Sweeten <hsweeten@visionengravers.com>
|
|
*
|
|
* Based on the pxa27x matrix keypad controller by Rodolfo Giometti.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* NOTE:
|
|
*
|
|
* The 3-key reset is triggered by pressing the 3 keys in
|
|
* Row 0, Columns 2, 4, and 7 at the same time. This action can
|
|
* be disabled by setting the EP93XX_KEYPAD_DISABLE_3_KEY flag.
|
|
*
|
|
* Normal operation for the matrix does not autorepeat the key press.
|
|
* This action can be enabled by setting the EP93XX_KEYPAD_AUTOREPEAT
|
|
* flag.
|
|
*/
|
|
|
|
#include <linux/platform_device.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/io.h>
|
|
#include <linux/input/matrix_keypad.h>
|
|
|
|
#include <mach/hardware.h>
|
|
#include <mach/ep93xx_keypad.h>
|
|
|
|
/*
|
|
* Keypad Interface Register offsets
|
|
*/
|
|
#define KEY_INIT 0x00 /* Key Scan Initialization register */
|
|
#define KEY_DIAG 0x04 /* Key Scan Diagnostic register */
|
|
#define KEY_REG 0x08 /* Key Value Capture register */
|
|
|
|
/* Key Scan Initialization Register bit defines */
|
|
#define KEY_INIT_DBNC_MASK (0x00ff0000)
|
|
#define KEY_INIT_DBNC_SHIFT (16)
|
|
#define KEY_INIT_DIS3KY (1<<15)
|
|
#define KEY_INIT_DIAG (1<<14)
|
|
#define KEY_INIT_BACK (1<<13)
|
|
#define KEY_INIT_T2 (1<<12)
|
|
#define KEY_INIT_PRSCL_MASK (0x000003ff)
|
|
#define KEY_INIT_PRSCL_SHIFT (0)
|
|
|
|
/* Key Scan Diagnostic Register bit defines */
|
|
#define KEY_DIAG_MASK (0x0000003f)
|
|
#define KEY_DIAG_SHIFT (0)
|
|
|
|
/* Key Value Capture Register bit defines */
|
|
#define KEY_REG_K (1<<15)
|
|
#define KEY_REG_INT (1<<14)
|
|
#define KEY_REG_2KEYS (1<<13)
|
|
#define KEY_REG_1KEY (1<<12)
|
|
#define KEY_REG_KEY2_MASK (0x00000fc0)
|
|
#define KEY_REG_KEY2_SHIFT (6)
|
|
#define KEY_REG_KEY1_MASK (0x0000003f)
|
|
#define KEY_REG_KEY1_SHIFT (0)
|
|
|
|
#define EP93XX_MATRIX_SIZE (EP93XX_MATRIX_ROWS * EP93XX_MATRIX_COLS)
|
|
|
|
struct ep93xx_keypad {
|
|
struct ep93xx_keypad_platform_data *pdata;
|
|
struct input_dev *input_dev;
|
|
struct clk *clk;
|
|
|
|
void __iomem *mmio_base;
|
|
|
|
unsigned int matrix_keycodes[EP93XX_MATRIX_SIZE];
|
|
|
|
int key1;
|
|
int key2;
|
|
|
|
int irq;
|
|
|
|
bool enabled;
|
|
};
|
|
|
|
static void ep93xx_keypad_build_keycode(struct ep93xx_keypad *keypad)
|
|
{
|
|
struct ep93xx_keypad_platform_data *pdata = keypad->pdata;
|
|
struct input_dev *input_dev = keypad->input_dev;
|
|
unsigned int *key;
|
|
int i;
|
|
|
|
key = &pdata->matrix_key_map[0];
|
|
for (i = 0; i < pdata->matrix_key_map_size; i++, key++) {
|
|
int row = KEY_ROW(*key);
|
|
int col = KEY_COL(*key);
|
|
int code = KEY_VAL(*key);
|
|
|
|
keypad->matrix_keycodes[(row << 3) + col] = code;
|
|
__set_bit(code, input_dev->keybit);
|
|
}
|
|
}
|
|
|
|
static irqreturn_t ep93xx_keypad_irq_handler(int irq, void *dev_id)
|
|
{
|
|
struct ep93xx_keypad *keypad = dev_id;
|
|
struct input_dev *input_dev = keypad->input_dev;
|
|
unsigned int status;
|
|
int keycode, key1, key2;
|
|
|
|
status = __raw_readl(keypad->mmio_base + KEY_REG);
|
|
|
|
keycode = (status & KEY_REG_KEY1_MASK) >> KEY_REG_KEY1_SHIFT;
|
|
key1 = keypad->matrix_keycodes[keycode];
|
|
|
|
keycode = (status & KEY_REG_KEY2_MASK) >> KEY_REG_KEY2_SHIFT;
|
|
key2 = keypad->matrix_keycodes[keycode];
|
|
|
|
if (status & KEY_REG_2KEYS) {
|
|
if (keypad->key1 && key1 != keypad->key1 && key2 != keypad->key1)
|
|
input_report_key(input_dev, keypad->key1, 0);
|
|
|
|
if (keypad->key2 && key1 != keypad->key2 && key2 != keypad->key2)
|
|
input_report_key(input_dev, keypad->key2, 0);
|
|
|
|
input_report_key(input_dev, key1, 1);
|
|
input_report_key(input_dev, key2, 1);
|
|
|
|
keypad->key1 = key1;
|
|
keypad->key2 = key2;
|
|
|
|
} else if (status & KEY_REG_1KEY) {
|
|
if (keypad->key1 && key1 != keypad->key1)
|
|
input_report_key(input_dev, keypad->key1, 0);
|
|
|
|
if (keypad->key2 && key1 != keypad->key2)
|
|
input_report_key(input_dev, keypad->key2, 0);
|
|
|
|
input_report_key(input_dev, key1, 1);
|
|
|
|
keypad->key1 = key1;
|
|
keypad->key2 = 0;
|
|
|
|
} else {
|
|
input_report_key(input_dev, keypad->key1, 0);
|
|
input_report_key(input_dev, keypad->key2, 0);
|
|
|
|
keypad->key1 = keypad->key2 = 0;
|
|
}
|
|
input_sync(input_dev);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void ep93xx_keypad_config(struct ep93xx_keypad *keypad)
|
|
{
|
|
struct ep93xx_keypad_platform_data *pdata = keypad->pdata;
|
|
unsigned int val = 0;
|
|
|
|
if (pdata->flags & EP93XX_KEYPAD_KDIV)
|
|
clk_set_rate(keypad->clk, EP93XX_KEYTCHCLK_DIV4);
|
|
else
|
|
clk_set_rate(keypad->clk, EP93XX_KEYTCHCLK_DIV16);
|
|
|
|
if (pdata->flags & EP93XX_KEYPAD_DISABLE_3_KEY)
|
|
val |= KEY_INIT_DIS3KY;
|
|
if (pdata->flags & EP93XX_KEYPAD_DIAG_MODE)
|
|
val |= KEY_INIT_DIAG;
|
|
if (pdata->flags & EP93XX_KEYPAD_BACK_DRIVE)
|
|
val |= KEY_INIT_BACK;
|
|
if (pdata->flags & EP93XX_KEYPAD_TEST_MODE)
|
|
val |= KEY_INIT_T2;
|
|
|
|
val |= ((pdata->debounce << KEY_INIT_DBNC_SHIFT) & KEY_INIT_DBNC_MASK);
|
|
|
|
val |= ((pdata->prescale << KEY_INIT_PRSCL_SHIFT) & KEY_INIT_PRSCL_MASK);
|
|
|
|
__raw_writel(val, keypad->mmio_base + KEY_INIT);
|
|
}
|
|
|
|
static int ep93xx_keypad_open(struct input_dev *pdev)
|
|
{
|
|
struct ep93xx_keypad *keypad = input_get_drvdata(pdev);
|
|
|
|
if (!keypad->enabled) {
|
|
ep93xx_keypad_config(keypad);
|
|
clk_enable(keypad->clk);
|
|
keypad->enabled = true;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ep93xx_keypad_close(struct input_dev *pdev)
|
|
{
|
|
struct ep93xx_keypad *keypad = input_get_drvdata(pdev);
|
|
|
|
if (keypad->enabled) {
|
|
clk_disable(keypad->clk);
|
|
keypad->enabled = false;
|
|
}
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_PM
|
|
/*
|
|
* NOTE: I don't know if this is correct, or will work on the ep93xx.
|
|
*
|
|
* None of the existing ep93xx drivers have power management support.
|
|
* But, this is basically what the pxa27x_keypad driver does.
|
|
*/
|
|
static int ep93xx_keypad_suspend(struct platform_device *pdev,
|
|
pm_message_t state)
|
|
{
|
|
struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
|
|
struct input_dev *input_dev = keypad->input_dev;
|
|
|
|
mutex_lock(&input_dev->mutex);
|
|
|
|
if (keypad->enabled) {
|
|
clk_disable(keypad->clk);
|
|
keypad->enabled = false;
|
|
}
|
|
|
|
mutex_unlock(&input_dev->mutex);
|
|
|
|
if (device_may_wakeup(&pdev->dev))
|
|
enable_irq_wake(keypad->irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ep93xx_keypad_resume(struct platform_device *pdev)
|
|
{
|
|
struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
|
|
struct input_dev *input_dev = keypad->input_dev;
|
|
|
|
if (device_may_wakeup(&pdev->dev))
|
|
disable_irq_wake(keypad->irq);
|
|
|
|
mutex_lock(&input_dev->mutex);
|
|
|
|
if (input_dev->users) {
|
|
if (!keypad->enabled) {
|
|
ep93xx_keypad_config(keypad);
|
|
clk_enable(keypad->clk);
|
|
keypad->enabled = true;
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&input_dev->mutex);
|
|
|
|
return 0;
|
|
}
|
|
#else /* !CONFIG_PM */
|
|
#define ep93xx_keypad_suspend NULL
|
|
#define ep93xx_keypad_resume NULL
|
|
#endif /* !CONFIG_PM */
|
|
|
|
static int __devinit ep93xx_keypad_probe(struct platform_device *pdev)
|
|
{
|
|
struct ep93xx_keypad *keypad;
|
|
struct input_dev *input_dev;
|
|
struct resource *res;
|
|
int err;
|
|
|
|
keypad = kzalloc(sizeof(struct ep93xx_keypad), GFP_KERNEL);
|
|
if (!keypad)
|
|
return -ENOMEM;
|
|
|
|
keypad->pdata = pdev->dev.platform_data;
|
|
if (!keypad->pdata) {
|
|
err = -EINVAL;
|
|
goto failed_free;
|
|
}
|
|
|
|
keypad->irq = platform_get_irq(pdev, 0);
|
|
if (!keypad->irq) {
|
|
err = -ENXIO;
|
|
goto failed_free;
|
|
}
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res) {
|
|
err = -ENXIO;
|
|
goto failed_free;
|
|
}
|
|
|
|
res = request_mem_region(res->start, resource_size(res), pdev->name);
|
|
if (!res) {
|
|
err = -EBUSY;
|
|
goto failed_free;
|
|
}
|
|
|
|
keypad->mmio_base = ioremap(res->start, resource_size(res));
|
|
if (keypad->mmio_base == NULL) {
|
|
err = -ENXIO;
|
|
goto failed_free_mem;
|
|
}
|
|
|
|
err = ep93xx_keypad_acquire_gpio(pdev);
|
|
if (err)
|
|
goto failed_free_io;
|
|
|
|
keypad->clk = clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(keypad->clk)) {
|
|
err = PTR_ERR(keypad->clk);
|
|
goto failed_free_gpio;
|
|
}
|
|
|
|
input_dev = input_allocate_device();
|
|
if (!input_dev) {
|
|
err = -ENOMEM;
|
|
goto failed_put_clk;
|
|
}
|
|
|
|
keypad->input_dev = input_dev;
|
|
|
|
input_dev->name = pdev->name;
|
|
input_dev->id.bustype = BUS_HOST;
|
|
input_dev->open = ep93xx_keypad_open;
|
|
input_dev->close = ep93xx_keypad_close;
|
|
input_dev->dev.parent = &pdev->dev;
|
|
input_dev->keycode = keypad->matrix_keycodes;
|
|
input_dev->keycodesize = sizeof(keypad->matrix_keycodes[0]);
|
|
input_dev->keycodemax = ARRAY_SIZE(keypad->matrix_keycodes);
|
|
|
|
input_set_drvdata(input_dev, keypad);
|
|
|
|
input_dev->evbit[0] = BIT_MASK(EV_KEY);
|
|
if (keypad->pdata->flags & EP93XX_KEYPAD_AUTOREPEAT)
|
|
input_dev->evbit[0] |= BIT_MASK(EV_REP);
|
|
|
|
ep93xx_keypad_build_keycode(keypad);
|
|
platform_set_drvdata(pdev, keypad);
|
|
|
|
err = request_irq(keypad->irq, ep93xx_keypad_irq_handler,
|
|
IRQF_DISABLED, pdev->name, keypad);
|
|
if (err)
|
|
goto failed_free_dev;
|
|
|
|
err = input_register_device(input_dev);
|
|
if (err)
|
|
goto failed_free_irq;
|
|
|
|
device_init_wakeup(&pdev->dev, 1);
|
|
|
|
return 0;
|
|
|
|
failed_free_irq:
|
|
free_irq(keypad->irq, pdev);
|
|
platform_set_drvdata(pdev, NULL);
|
|
failed_free_dev:
|
|
input_free_device(input_dev);
|
|
failed_put_clk:
|
|
clk_put(keypad->clk);
|
|
failed_free_gpio:
|
|
ep93xx_keypad_release_gpio(pdev);
|
|
failed_free_io:
|
|
iounmap(keypad->mmio_base);
|
|
failed_free_mem:
|
|
release_mem_region(res->start, resource_size(res));
|
|
failed_free:
|
|
kfree(keypad);
|
|
return err;
|
|
}
|
|
|
|
static int __devexit ep93xx_keypad_remove(struct platform_device *pdev)
|
|
{
|
|
struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
|
|
struct resource *res;
|
|
|
|
free_irq(keypad->irq, pdev);
|
|
|
|
platform_set_drvdata(pdev, NULL);
|
|
|
|
if (keypad->enabled)
|
|
clk_disable(keypad->clk);
|
|
clk_put(keypad->clk);
|
|
|
|
input_unregister_device(keypad->input_dev);
|
|
|
|
ep93xx_keypad_release_gpio(pdev);
|
|
|
|
iounmap(keypad->mmio_base);
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
release_mem_region(res->start, resource_size(res));
|
|
|
|
kfree(keypad);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver ep93xx_keypad_driver = {
|
|
.driver = {
|
|
.name = "ep93xx-keypad",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = ep93xx_keypad_probe,
|
|
.remove = __devexit_p(ep93xx_keypad_remove),
|
|
.suspend = ep93xx_keypad_suspend,
|
|
.resume = ep93xx_keypad_resume,
|
|
};
|
|
|
|
static int __init ep93xx_keypad_init(void)
|
|
{
|
|
return platform_driver_register(&ep93xx_keypad_driver);
|
|
}
|
|
|
|
static void __exit ep93xx_keypad_exit(void)
|
|
{
|
|
platform_driver_unregister(&ep93xx_keypad_driver);
|
|
}
|
|
|
|
module_init(ep93xx_keypad_init);
|
|
module_exit(ep93xx_keypad_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("H Hartley Sweeten <hsweeten@visionengravers.com>");
|
|
MODULE_DESCRIPTION("EP93xx Matrix Keypad Controller");
|
|
MODULE_ALIAS("platform:ep93xx-keypad");
|